A first-order liquid–liquid phase transition in phosphorus

Abstract

First-order structural phase transitions are common in crystalline solids, whereas first-order liquid–liquid phase transitions (that is, transitions between two distinct liquid forms with different density and entropy) are exceedingly rare in pure substances1,2,3,4. But recent theoretical and experimental studies have shown evidence for such a transition in several materials, including supercooled water5,6,7,8 and liquid carbon9,10. Here we report an in situ X-ray diffraction observation of a liquid–liquid transition in phosphorus, involving an abrupt, pressure-induced structural change between two distinct liquid forms. In addition to a known form of liquid phosphorus—a molecular liquid comprising tetrahedral P4 molecules—we have found a polymeric form at pressures above 1 GPa. Changing the pressure results in a reversible transformation from the low-pressure molecular form into the high-pressure polymeric form. The transformation is sharp and rapid, occurring within a few minutes over a pressure range of less than 0.02 GPa. During the transformation, the two forms of liquid coexist. These features are strongly suggestive of a first-order liquid–liquid phase transition.

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Figure 1: Experimental paths in a previously reported19,20 phase diagram of black P.
Figure 2: Structure factor, S(Q), for liquid P at several pressures.
Figure 3: Radial distribution function at several pressures derived from S(Q) for liquid P.
Figure 4: X-ray diffraction patterns.

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Acknowledgements

We thank K. Tsuji and Y. Akahama for discussions.

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Correspondence to Yoshinori Katayama.

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Katayama, Y., Mizutani, T., Utsumi, W. et al. A first-order liquid–liquid phase transition in phosphorus. Nature 403, 170–173 (2000). https://doi.org/10.1038/35003143

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